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Issue 525115: Add generated code for ascii string comparison... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 10 years, 11 months ago
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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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111 } 111 }
112 112
113 113
114 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as 114 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as
115 // the result when either (or both) the operands are NaN. 115 // the result when either (or both) the operands are NaN.
116 function COMPARE(x, ncr) { 116 function COMPARE(x, ncr) {
117 var left; 117 var left;
118 118
119 // Fast cases for string, numbers and undefined compares. 119 // Fast cases for string, numbers and undefined compares.
120 if (IS_STRING(this)) { 120 if (IS_STRING(this)) {
121 if (IS_STRING(x)) return %StringCompare(this, x); 121 if (IS_STRING(x)) return %_StringCompare(this, x);
122 if (IS_UNDEFINED(x)) return ncr; 122 if (IS_UNDEFINED(x)) return ncr;
123 left = this; 123 left = this;
124 } else if (IS_NUMBER(this)) { 124 } else if (IS_NUMBER(this)) {
125 if (IS_NUMBER(x)) return %NumberCompare(this, x, ncr); 125 if (IS_NUMBER(x)) return %NumberCompare(this, x, ncr);
126 if (IS_UNDEFINED(x)) return ncr; 126 if (IS_UNDEFINED(x)) return ncr;
127 left = this; 127 left = this;
128 } else if (IS_UNDEFINED(this)) { 128 } else if (IS_UNDEFINED(this)) {
129 return ncr; 129 return ncr;
130 } else { 130 } else {
131 if (IS_UNDEFINED(x)) return ncr; 131 if (IS_UNDEFINED(x)) return ncr;
132 left = %ToPrimitive(this, NUMBER_HINT); 132 left = %ToPrimitive(this, NUMBER_HINT);
133 } 133 }
134 134
135 // Default implementation. 135 // Default implementation.
136 var right = %ToPrimitive(x, NUMBER_HINT); 136 var right = %ToPrimitive(x, NUMBER_HINT);
137 if (IS_STRING(left) && IS_STRING(right)) { 137 if (IS_STRING(left) && IS_STRING(right)) {
138 return %StringCompare(left, right); 138 return %_StringCompare(left, right);
139 } else { 139 } else {
140 var left_number = %ToNumber(left); 140 var left_number = %ToNumber(left);
141 var right_number = %ToNumber(right); 141 var right_number = %ToNumber(right);
142 if (NUMBER_IS_NAN(left_number) || NUMBER_IS_NAN(right_number)) return ncr; 142 if (NUMBER_IS_NAN(left_number) || NUMBER_IS_NAN(right_number)) return ncr;
143 return %NumberCompare(left_number, right_number, ncr); 143 return %NumberCompare(left_number, right_number, ncr);
144 } 144 }
145 } 145 }
146 146
147 147
148 148
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617 throw %MakeTypeError('cannot_convert_to_primitive', []); 617 throw %MakeTypeError('cannot_convert_to_primitive', []);
618 } 618 }
619 619
620 620
621 // NOTE: Setting the prototype for Array must take place as early as 621 // NOTE: Setting the prototype for Array must take place as early as
622 // possible due to code generation for array literals. When 622 // possible due to code generation for array literals. When
623 // generating code for a array literal a boilerplate array is created 623 // generating code for a array literal a boilerplate array is created
624 // that is cloned when running the code. It is essiential that the 624 // that is cloned when running the code. It is essiential that the
625 // boilerplate gets the right prototype. 625 // boilerplate gets the right prototype.
626 %FunctionSetPrototype($Array, new $Array(0)); 626 %FunctionSetPrototype($Array, new $Array(0));
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